A material for the manufacturing of ophthalmic implants by photo-polymerization method

A material for manufacture of ophthalmic implants by photo-polymerization, comprising:

• a) 60-70 wt. % of an oligomer of urethanedi(meth)acrylate having terminal (meth)acrylate fragments, the oligomer of urethanedi(meth)acrylate having components (I) (meth)acrylate, (II) diisocyanate, and (III) polyol, according to the following structural formula:
• hydroxy(meth)acrylate′-{(diisocyanate′-polyol-diisocyanate″)}-hydroxy(meth)acrylate″,
• where one of the isocyanate groups of diisocyanate′ and diisocyanate″, respectively, is connected to hydroxy(meth)acrylate′ and hydroxy(meth)acrylate′ to form a urethane bond, and where the remaining isocyanate group of diisocyanate′ and diisocyanate″, respectively, is connected to the hydroxyl group of polyol to form a urethane bond, where hydroxy(meth)acrylate′ and hydroxy(meth)acrylate″ may be the same or different, and diisocyanate′ and diisocyanate″ may be the same or different, and polyol in the oligomer of urethanedi(meth)acrylate can be any aliphatic diol with a branched chain, or a mixture of aliphatic diols with branched chains,
• b) 20-40 wt. % of components from a group of (meth)acrylate monomers with aromatic substituents in a side chain, including at least one of 2-phenoxyethylmethacrylate, benzylmethacrylate, benzyl-2-ethylacrylate, and phenylmethacrylate,
• c) 5-25 wt. % of components from a group of (meth)acrylate monomers with aliphatic branched substituents in a side chain, including at least one of tert-butylmethacrylate, isobutylmethacrylate, and 2-ethylhexylmethacrylate,
• d) at least 0.2 wt. % of one or more UV-absorbing components,
• e) 0.1 to 1 wt. % of a photopolymerization initiator,
• f) 0.005 to 0.5 wt. % of a radical polymerization inhibitor, including at least one of 4-tert-butylpyrocatechol;
• tert-butylhydroquinone;
• 1,4-benzoquinone;
• 6-tert-butyl-2,4-xylenol;
• 2-tert-butyl-1,4-benzoquinone;
• 3,5-di-tert-butyl-o-benzoquinone;
• 2,6-di-tert-butyl-p-cresol;
• 2,6-di-tert-butylphenol;
• hydroquinone;
• and 4-methoxyphenol.